Gamerscore modding, the massive disparity in the difficulty of achievements... I can only assume that the achievements themselves would be massively scaled up in difficulty.
Some bonus avatar stuff for reaching milestones would be nice, like how you sometimes unlock avatar awards in games... But to replace currency? Not a chance. Not because MS is "greedy" or any of that crap, it's just too flimsy a system, no standardisation, and why should the casual gamers who can't clear CoD on Veteran have less access to this form of locked[1] currency?
[1] -By "locked" I mean that achievements are "one time only" things. You can unlock all the CoD points/Reach credits you like by replaying, but you only get one lot of GS from an achievement, some of which are nigh impossible to get for some people (due to difficulty, or glitch, I'm looking at you CoD4 intel ¬__¬ )
Some bonus avatar stuff for reaching milestones would be nice, like how you sometimes unlock avatar awards in games... But to replace currency? Not a chance. Not because MS is "greedy" or any of that crap, it's just too flimsy a system, no standardisation, and why should the casual gamers who can't clear CoD on Veteran have less access to this form of locked[1] currency?
[1] -By "locked" I mean that achievements are "one time only" things. You can unlock all the CoD points/Reach credits you like by replaying, but you only get one lot of GS from an achievement, some of which are nigh impossible to get for some people (due to difficulty, or glitch, I'm looking at you CoD4 intel ¬__¬ )